240166261 has 2 divisors, whose sum is σ = 240166262. Its totient is φ = 240166260.

The previous prime is 240166249. The next prime is 240166279. The reversal of 240166261 is 162661042.

240166261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236206161 + 3960100 = 15369^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 240166261 - 2⁷ = 240166133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240166231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120083130 + 120083131.

It is an arithmetic number, because the mean of its divisors is an integer number (120083131).

Almost surely, 2^240166261 is an apocalyptic number.

It is an amenable number.

240166261 is a deficient number, since it is larger than the sum of its proper divisors (1).

240166261 is an equidigital number, since it uses as much as digits as its factorization.

240166261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 240166261 is about 15497.2985065140. The cubic root of 240166261 is about 621.5899712837.

The spelling of 240166261 in words is "two hundred forty million, one hundred sixty-six thousand, two hundred sixty-one".